Aman stands still on a moving walkway that is going at a speed of 0.3 m/s to the south. what is the velocity of the man according to a stationary observer?

With respect to stationary observer the velocity of man is 0.3 m/s towards South

Explanation:

As we know that here man is standing still on the moving walkway

so here we can say that velocity of man with respect to walkway is zero

now as per relative velocity concept we know

here we know

= velocity of man with respect to stationary observer

= velocity of walkway

now from above equation we have

now plug in all values in it

towards South

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j